I question your reading comprehension. It’s much easier to claim something causes harm than to demonstrate it would.

History doesn’t support your assumptions: recalling the civil rights & free speech movements in the US, civil rights advanced despite similar free speech constraints I’ve advocated (eg, clear & present danger or imminent lawless action standard) and despite a harsher environment with Jim Crow laws and white supremacists speaking freely. Civil rights can advance with such narrow restrictions on free speech and have before when circumstances were worse.